1/*-
2 * Copyright (c) 2013 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Matt Thomas of 3am Software Foundry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <machine/asm.h>
31
32/*
33 * Implementation of strcat using strlen/strcpy.
34 */
35ENTRY(strcat)
36#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
37# if !defined(__ARM_DWARF_EH__)
38          .fnstart
39# endif
40          .cfi_startproc
41#endif
42          push      {r3-r5, lr}                   /* save registers */
43#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
44# if !defined(__ARM_DWARF_EH__)
45          .save     {r3-r5, lr}
46# endif
47          .cfi_def_cfa_offset 16
48          .cfi_offset 14, -4
49          .cfi_offset 5, -8
50          .cfi_offset 4, -12
51          .cfi_offset 3, -16
52#endif
53
54          mov       r4, r0                        /* save dst */
55          mov       r5, r1                        /* save append */
56
57          bl        PLT_SYM(strlen)               /* find length of dst */
58
59          adds      r0, r0, r4                    /* add to dst pointer */
60          mov       r1, r5                        /* fetch append */
61          bl        PLT_SYM(strcpy)               /* append string */
62
63          mov       r0, r4                        /* restore dst as return value */
64          pop       {r3-r5, pc}                   /* restore registers */
65#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
66          .cfi_endproc
67# if !defined(__ARM_DWARF_EH__)
68          .fnend
69# endif
70#endif
71END(strcat)
72